An adaptable, energy efficient chemical process is employed to synthesize Cu^2+engrafted MgAl2O4 nanoparticles(Mg1-xCuxAl2O4, x = 0, 0.1, 0.3, 0.5 abbreviated as MCA0, MCA1, MCA3,and MCA5 respectively), using chelatin...An adaptable, energy efficient chemical process is employed to synthesize Cu^2+engrafted MgAl2O4 nanoparticles(Mg1-xCuxAl2O4, x = 0, 0.1, 0.3, 0.5 abbreviated as MCA0, MCA1, MCA3,and MCA5 respectively), using chelating ligand and the calcination temperature was determined by the thermogravimetric analysis of the precursor mass.They acted as good fluoride adsorbent in the presence of co-ions, different pH(2–11) via chemisorption revealed from Fourier-transform infrared spectroscopy(FTIR) and photodegraded Methylene Blue(MB).The satisfactory results were for MCA1(specific surface area 25.05 m^2/g) with 97%fluoride removal at pH 7.0 for the 10 mg/L initial fluoride concentration for 1.5 g/L adsorbent dose with 45 min contact time obeying the Langmuir isotherm model with negative thermodynamic parameters and 4 mmol of MCA3 with 98.51% photodegradation for 10-5 mol/L MB solution obeying pseudo-second-order and pseudo-first-order kinetics respectively.The proposed photodegradation mechanism of MB was established by the FTIR and high-performance liquid chromatography(HPLC) analysis.The nanoparticles are cubic, estimated through X-ray diffraction(XRD) and transmission electron microscopy(TEM) analysis.The band gap energies, grain size, and the effective working pH were estimated by diffuse reflectance spectra(DRS), scanning electron microscope(SEM), and zero-point potential analysis respectively.A soil candle with MCA1 also fabricated for the household purpose and tested with some fluorinated field samples.The MCA3 was able to enhance the latent fingerprint on smooth surfaces.展开更多
Antimicrobials are frequently used in both humans and animals for the treatment of bacterially-generated ill-nesses.Antibiotic usage has increased for more than 40%from last 15 years globally per day in both human pop...Antimicrobials are frequently used in both humans and animals for the treatment of bacterially-generated ill-nesses.Antibiotic usage has increased for more than 40%from last 15 years globally per day in both human populations and farm animals leading to the large-scale discharge of antibiotic residues into wastewater.Most antibiotics end up in sewer systems,either directly from industry or healthcare systems,or indirectly from hu-mans and animals after being partially metabolized or broken down following consumption.To prevent additional antibiotic compound pollution,which eventually impacts on the spread of antibiotic resistance,it is crucial to remove antibiotic residues from wastewater.Antibiotic accumulation and antibiotic resistance genes cannot be effectively and efficiently eliminated by conventional sewage treatment plants.Because of their high energy requirements and operating costs,many of the available technologies are not feasible.However,the biosorp-tion method,which uses low-cost biomass as the biosorbent,is an alternative technique to potentially address these problems.An extensive literature survey focusing on developments in the field was conducted using En-glish language electronic databases,such as PubMed,Google Scholar,Pubag,Google books,and ResearchGate,to understand the relative value of the available antibiotic removal methods.The predominant techniques for eliminating antibiotic residues from wastewater were categorized and defined by example.The approaches were contrasted,and the benefits and drawbacks were highlighted.Additionally,we included a few antibiotics whose removal from aquatic environments has been the subject of extensive research.Lastly,a few representative pub-lications were identified that provide specific information on the removal rates attained by each technique.This review provides evidence that biosorption of antibiotic residues from biological waste using natural biosorbent materials is an affordable and effective technique for eliminating antibiotic residues from wastewater.展开更多
基金Department of Science and Technology,Government of West Bengal,India,vide project sanction(No.674(sanc)/ST/P/S&T/15G/5/2016)dated 09/11/2016 for financial supportthe Council of Scientific and Industrial Research(CSIR),Government of India for the Senior Research fellowship(No.09/1156(0004)/18-EMR-I).
文摘An adaptable, energy efficient chemical process is employed to synthesize Cu^2+engrafted MgAl2O4 nanoparticles(Mg1-xCuxAl2O4, x = 0, 0.1, 0.3, 0.5 abbreviated as MCA0, MCA1, MCA3,and MCA5 respectively), using chelating ligand and the calcination temperature was determined by the thermogravimetric analysis of the precursor mass.They acted as good fluoride adsorbent in the presence of co-ions, different pH(2–11) via chemisorption revealed from Fourier-transform infrared spectroscopy(FTIR) and photodegraded Methylene Blue(MB).The satisfactory results were for MCA1(specific surface area 25.05 m^2/g) with 97%fluoride removal at pH 7.0 for the 10 mg/L initial fluoride concentration for 1.5 g/L adsorbent dose with 45 min contact time obeying the Langmuir isotherm model with negative thermodynamic parameters and 4 mmol of MCA3 with 98.51% photodegradation for 10-5 mol/L MB solution obeying pseudo-second-order and pseudo-first-order kinetics respectively.The proposed photodegradation mechanism of MB was established by the FTIR and high-performance liquid chromatography(HPLC) analysis.The nanoparticles are cubic, estimated through X-ray diffraction(XRD) and transmission electron microscopy(TEM) analysis.The band gap energies, grain size, and the effective working pH were estimated by diffuse reflectance spectra(DRS), scanning electron microscope(SEM), and zero-point potential analysis respectively.A soil candle with MCA1 also fabricated for the household purpose and tested with some fluorinated field samples.The MCA3 was able to enhance the latent fingerprint on smooth surfaces.
文摘Antimicrobials are frequently used in both humans and animals for the treatment of bacterially-generated ill-nesses.Antibiotic usage has increased for more than 40%from last 15 years globally per day in both human populations and farm animals leading to the large-scale discharge of antibiotic residues into wastewater.Most antibiotics end up in sewer systems,either directly from industry or healthcare systems,or indirectly from hu-mans and animals after being partially metabolized or broken down following consumption.To prevent additional antibiotic compound pollution,which eventually impacts on the spread of antibiotic resistance,it is crucial to remove antibiotic residues from wastewater.Antibiotic accumulation and antibiotic resistance genes cannot be effectively and efficiently eliminated by conventional sewage treatment plants.Because of their high energy requirements and operating costs,many of the available technologies are not feasible.However,the biosorp-tion method,which uses low-cost biomass as the biosorbent,is an alternative technique to potentially address these problems.An extensive literature survey focusing on developments in the field was conducted using En-glish language electronic databases,such as PubMed,Google Scholar,Pubag,Google books,and ResearchGate,to understand the relative value of the available antibiotic removal methods.The predominant techniques for eliminating antibiotic residues from wastewater were categorized and defined by example.The approaches were contrasted,and the benefits and drawbacks were highlighted.Additionally,we included a few antibiotics whose removal from aquatic environments has been the subject of extensive research.Lastly,a few representative pub-lications were identified that provide specific information on the removal rates attained by each technique.This review provides evidence that biosorption of antibiotic residues from biological waste using natural biosorbent materials is an affordable and effective technique for eliminating antibiotic residues from wastewater.
